[The following paragraph was effective for periods ended on or after June 25, 1983. It was amended, effective for audits of fiscal years beginning on or after December 15, 2010. See PCAOB Release No. 2010-004.

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To determine the number of items to be selected for a particular sample for a test of controls, the auditor should consider the tolerable rate of deviation from the controls being tested, the likely rate of deviations, and the allowable risk of assessing control risk too low. An auditor applies professional judgment to relate these factors in determining the appropriate sample size.